我试图选择 userName 和 groupId 重复的所有行,并且 userId 不是该 userName/groupId 组合的最大 userId。到目前为止,这是我的代码:
select *
from userTable u
where exists
(select *
from userTable u1
where userName <> '' and userName is not null
and u.userName = u1.userName and u.groupId = u1.groupId
and u.userId <> max(u1.userId)
group by userName, groupId
having count(*) > 1)
order by userName
然而,该行:
and u.userId <> u1.max(userId)
给我一个错误。
执行此查询的正确方法是什么?
SELECT u.*
FROM (
SELECT userName, groupId, MAX(userId) AS maxId
FROM userTable
GROUP BY
userName, groupId
HAVING COUNT(*) > 1
) q
JOIN userTable u
ON u.userName = q.userName
AND u.groupId = q.groupId
AND u.userId <> q.maxId
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